How jobtracker assign tasks to the tasktracker?
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What is data cleansing?
Explain what is sequencefileinputformat?
Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?
what is next step after mapper or maptask?
Why does one remove or add nodes in a Hadoop cluster frequently?
What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?
Have you ever used counters in hadoop?
What is LazyOutputFormat in Hadoop?
How to create a user in Hadoop?
According to IBM, what are the three characteristics of Big Data?
Mention what is rack awareness?
While starting hadoop services, datanode service is not running?
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